Why Ketamine Therapy Sometimes Fails, And What Responsible Protocol Design Looks Like

Ketamine therapy has become one of the most discussed developments in modern psychiatry. For patients living with treatment-resistant depressionDepression that persists despite adequate trials of antidepressant treatment., the possibility of relief measured in days rather than months is understandably compelling.

And for many individuals, ketamine therapy is transformative.

Yet as the field has evolved, clinicians have begun to recognize a deeper question beneath the enthusiasm. Early conversations focused largely on who should receive ketamine and how the medication should be delivered. Increasingly, attention is shifting to something equally important: How the treatment itself is designed.

This article is part of Fountain Health’s ongoing exploration of how ketamine therapy is evolving in modern psychiatric care.

Ketamine Therapy Is Not a Single Event

One of the most common misunderstandings surrounding ketamine therapy is the belief that it functions like a conventional medication, administered repeatedly until symptoms improve. Ketamine behaves differently.

Current research suggests that ketamine’s antidepressantA medication that alters brain chemistry to relieve depression. effects may be linked to rapid changes in glutamatergic signaling and the formation of new synaptic connections in the brain.¹ These biological changes temporarily increase the brain’s capacity for adaptation, a period often described as a neuroplasticityThe formation of synapses between neurons. window.

The window is powerful. It is also brief. Without a framework that supports stabilization during this period, neural systems often return toward their previous equilibrium.

Ketamine can initiate change. It does not automatically complete it.

When Protocol Design Becomes the Limiting Factor

When clinicians look closely at treatment outcomes, the difference rarely lies in the medication itself. More often, it lies in the structure surrounding it. Many treatment environments understandably focus first on access and administration. Ensuring that patients can safely receive ketamine is an essential step. But administration alone does not constitute a treatment protocol.

A thoughtful protocol considers:

• biological assessment before treatment
• careful calibration of dosing across sessions
• integration during periods of heightened neuroplasticity
• maintenance strategies that adapt as neural systems stabilize

When these elements are absent, outcomes can appear inconsistent. Not because ketamine failed, but because the surrounding architecture was incomplete. Across medicine, powerful therapies rarely succeed in isolation. They succeed within systems designed to support their biological effects.

Mental Health Is Biological

At Fountain Health, we approach ketamine therapy through a foundational principle:

Mental health is biological.

DepressionA prolonged low mood that interferes with life. is not a moral failing. AnxietyA state of worry or tension that disrupts focus and sleep. is not a character flaw. Treatment resistance is not a lack of effort. These conditions reflect dysregulation in neural circuitry, often involving glutamateA glutamate receptor involved in synaptic signaling, learning, and memory. signaling, stressThe body's response to external demands. Chronic stress disrupts hormones, sleep, and immune function.-response pathways, and impaired synaptic connectivity.

Ketamine acts on these biological systems, particularly through modulation of NMDA receptorsA glutamate receptor involved in synaptic signaling, learning, and memory. and downstream synaptogenesisThe formation of synapses between neurons..²

When psychiatric care respects that biology, treatment becomes less about administering substances and more about guiding the brain through periods of change.

Biological interventions require biological precision. Dosing matters. Timing matters. Environment matters.

The Treatment Environment Matters

Across medicine, powerful therapies are rarely delivered casually. Chemotherapy, anesthesia, and biologic infusions are administered within structured clinical environments where clinicians can observe, adapt, and respond.

Ketamine deserves similar stewardship. A physician-controlled setting allows treatment to evolve session by session. Infusion rates can be adjusted. Psychological responses can be supported. Physiological changes can be monitored.

Ketamine therapy creates a brief period during which neural circuits become more flexible. This period is not simply a pharmacological effect; it is an opportunity for biological recalibration. Without structure, that opportunity can close quickly. Neural systems tend to return toward familiar patterns unless new stability is supported.

In clinical practice, this is why the period surrounding treatment often matters as much as the infusion itself.

The Philosophy of Precision

Modern healthcare often favors scalability. Standardized protocols expand access. Fixed dosing simplifies distribution. Uniform processes improve efficiency.

Efficiency, however, is not the same as personalization.

In treatment-resistant depressionDepression that persists despite adequate trials of antidepressant treatment., especially when layered with anxietyA state of worry or tension that disrupts focus and sleep., traumaA deeply distressing experience that leaves lasting psychological impact. history, or substance vulnerability, small adjustments influence durability.

IV infusion allows those adjustments to occur in real time.

That is not a rejection of regulation.

It is an affirmation of physician stewardship.

From Treatment to System Design

Over time, clinicians working closely with ketamine therapy began noticing a pattern. Patients who experienced the most durable improvements were rarely those receiving medication alone.

They were those treated within structured systems of care.

At Fountain Health, this observation helped shape the development of our 4-Phase Ketamine Therapy Framework™, which approaches treatment as a continuum rather than a series of isolated sessions.

The framework includes:

Preparation — biological and psychological evaluation

Activation — carefully titrated therapeutic sessions

Integration — supporting the brain during heightened neuroplasticityThe formation of synapses between neurons.

Consolidation — recalibrating care as neural systems stabilize

(Click this link to learn more about The Fountain Health 4-Phase Ketamine Therapy Framework™)

Ketamine is not simply a treatment sessionScheduled appointments for therapies like IV ketamine or nutrient drips.. It is a system that begins before therapy and continues well beyond the infusions themselves.

The Future of Ketamine Therapy

Ketamine represents one of the most promising advances in psychiatric care in decades. But as the field matures, the conversation must move beyond whether ketamine works. The deeper question is:

How should it be delivered responsibly?

Durable outcomes depend not only on pharmacology but on thoughtful design - protocols that respect biology, environments that support adaptation, and clinicians willing to guide patients through periods of change.

In practice, these outcomes often rely upon how treatment evolves over time. Initial sessions may focus on stabilization, but subsequent phases require different goals: integrationThe process of making sense of and applying insights after a therapeutic experience such as ketamine therapy. of psychological insights, reinforcement of adaptive neural patterns, and gradual recalibration of maintenance intervals.

Ketamine may open the door to transformation. Thoughtful systems of care determine whether that transformation stabilizes into healing. In medicine, powerful tools demand careful stewardship.

Continue exploring ketamine therapy

• Treating Depression and Anxiety Together with Ketamine
• Spravato vs IV Ketamine: Precision and Delivery
• Why Ketamine Treatment Sometimes Fails

References

• Duman RS, Krystal JH. Ketamine and rapid-acting antidepressants: a new era in the treatment of mood disorders. Nature Reviews Drug Discovery. 2019.
• Abdallah CG, Sanacora G, Duman RS, Krystal JH. Ketamine and rapid-acting antidepressants: insights into neural plasticity. Neuropsychopharmacology. 2021.
• Phillips JL, Norris S, Talbot J, et al. Single, repeated, and maintenance ketamine infusions for treatment-resistant depression. American Journal of Psychiatry. 2019.
• Short B, Fong J, Galvez V, et al. Side-effects associated with ketamine use in depression: a systematic review. The Lancet Psychiatry. 2018.

Sanacora G, Frye MA, McDonald W, et al. A consensus statement on the use of ketamine in the treatment of mood disorders. JAMA Psychiatry. 2017.

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About Fountain: Fountain Health NYC is a next-generation bioloy-first mental health and medical wellness center exploring the frontier between neuroscience, technology, and human consciousness; redefining what healing can look like in the 21st century.